Key Takeaways
- Subtract barbell and collar weight from your target, then divide by 2 to get the load per side. Load plates from largest to smallest.[1]
- Olympic bars weigh 45 lbs (20 kg); women's bars 33 lbs (15 kg). Always verify your gym's bar weight before loading.
- Load both sides evenly to keep the bar balanced. Uneven loading can affect bar path and stability.[2]
- Not all target weights can be hit exactly with standard plate combinations. The calculator shows the closest possible load when exact match is unavailable.
- Use collars to secure plates. Include collar weight (typically 5 lbs / 2.5 kg total) in your calculations for accuracy.
How to Load Weight Plates
Loading a barbell correctly ensures the bar is balanced and your actual weight matches your target. Follow these steps:
- Determine load per side: Total weight = bar + (plates per side × 2) + collars. So: plates per side = (target − bar − collars) ÷ 2.
- Add plates from largest to smallest: Start with the heaviest plates (e.g., 45 lb) closest to the collar, then add progressively smaller plates outward. This keeps the bar stable and makes changes easier.
- Load both sides evenly: Add the same plates to both sides before adding more. Never load one side fully before the other.
- Secure with collars: Use spring or lock collars to prevent plates from sliding. Collars add weight — typically 5 lbs (2.5 kg) total — so include them in your math.
Research on barbell and plate setup shows that bar weight and plate configuration can affect lift mechanics.[1][2] Even loading supports consistent bar path and reduces asymmetry.
Common Barbell Weights
Barbell weight varies by type. Using the wrong weight leads to incorrect total load. Verify your gym's bar before calculating:
| Type | LBS | KG |
|---|---|---|
| Olympic Barbell | 45 | 20 |
| Women's Barbell | 33 | 15 |
| Training Barbell | 35 | 15 |
Standard Weight Plate Sizes
Plate sizes and colors vary by region and manufacturer. IWF (International Weightlifting Federation) colors are standard for kg plates; lb plates often use gym-specific colors.
Pounds (LBS)
| Weight | Color |
|---|---|
| 45 | Blue |
| 35 | Yellow |
| 25 | Green |
| 10 | Gray |
| 5 | Purple |
| 2.5 | Pink |
Kilograms (KG) — IWF
| Weight | Color |
|---|---|
| 25 | Red |
| 20 | Blue |
| 15 | Yellow |
| 10 | Green |
| 5 | White |
| 2.5 | Red |
| 1.25 | Gray |
Quick Loading Combinations
Common total weights on an Olympic bar (45 lb) with typical plate setups:
| Total (LBS) | Per Side | Total (KG) | Per Side |
|---|---|---|---|
| 135 | 45 (bar + 45 each side) | 60 | 20 (bar + 20 each side) |
| 185 | 45 + 25 | 80 | 20 + 20 |
| 225 | 45 + 45 | 100 | 25 + 25 |
| 275 | 45 + 45 + 25 | 120 | 25 + 25 + 10 |
| 315 | 45 + 45 + 45 | 140 | 25 + 25 + 20 |
| 405 | 45 + 45 + 45 + 45 | 180 | 25 + 25 + 25 + 25 |
Tips for Safe Loading
Follow these practices to load the bar safely and accurately:
- Load both sides evenly: Add plates in pairs — one per side — to avoid tipping. Never fully load one side before the other.
- Use collars: Spring or lock collars keep plates from sliding during the lift. Unsecured plates can shift and affect balance.[2]
- Check clips before lifting: Ensure collars are secure. A loose collar can allow plates to slide off, especially on deadlifts or when re-racking.
- Match your gym's equipment: Enable or disable plate sizes in the calculator settings to reflect what your gym has. This avoids impossible combinations.
- Verify bar weight: Some bars are labeled; others are not. When in doubt, weigh the bar or ask staff. Using the wrong bar weight leads to incorrect total load.
For programming your lifts, use the 5/3/1 Calculator or 5x5 One-Rep Max Calculator to plan your weights, then use this calculator to load the bar correctly.
Frequently Asked Questions
Sources & References
- Effect of Barbell Weight on the Structure of the Flat Bench Press. Król H, Gołaś A. Journal of Strength and Conditioning Research (2017)
- The Effect of Different Weight Plate Widths on the Biomechanics of the Bench Press. Fiedler MJ, Triplett NT, Hamilton KC, Needle AR, van Werkhoven H. Journal of Strength and Conditioning Research (2024)
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Disclaimer: This tool is for informational and personal journaling purposes only. Results are estimates based on published formulas and may vary based on individual factors such as genetics, training history, and measurement technique.